Blue Light-Induced Lethality of a Cell Wall-Deficient Mutant of the Unicellular Green Alga Chlamydomonas reinhardtii : GROWTH AND DEVELOPMENT : ENVIRONMENTAL AND STRESS RESPONSES

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When synchronized cultures of a cell wall-deficient Chlamydomonas reinhardtii mutant strain were grown under heterotrophic conditions and subsequently transferred to the light, a considerable decrease of the cell number was observed during transition to the cell division phase. Lethality of the wall-deficient cells was induced by blue light, but not by red or far-red light, and could not be prevented by addition of the photosystem II inhibitor DCMU. The light-induced lethality was found to be restricted to wall-deficient cells which were agitated by bubbling with filtered air or nitrogen or vigorously shaken during the transition to the cell division phase. There-fore, a (blue) light-induced sensitivity to any mechanical stress seems to be the cause for cell death. In heterotrophically growing cultures of the Chlamydomonas wild-type, illumination with blue or white light did not cause a decrease of the cell number but only a delay of cell divisions. The latter effect was also observed in case of the wall-deficient mutant. Both blue light effects are observed during the transition to the cell division phase and can be induced during the same period of the cell cycle. Furthermore, the (blue) light-induced lethality of wall-deficient cells was found to be prevented when the transition to the cell division phase was inhibited by addition of antibiotics. Therefore, we assume that there is a connection between the blue light-induced sensitivity to mechanical stress and the blue light-induced delay of cell divisions.
日本植物生理学会の論文

Blue Light-Induced Lethality of a Cell Wall-Deficient Mutant of the Unicellular Green Alga Chlamydomonas reinhardtii : GROWTH AND DEVELOPMENT : ENVIRONMENTAL AND STRESS RESPONSES

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